Refine
Year of publication
Document Type
- Preprint (752)
- Article (439)
- Conference Proceeding (4)
- Book (1)
- Working Paper (1)
Has Fulltext
- yes (1197)
Is part of the Bibliography
- no (1197)
Keywords
- Heavy Ion Experiments (21)
- Hadron-Hadron Scattering (14)
- Hadron-Hadron scattering (experiments) (11)
- LHC (11)
- Heavy-ion collision (6)
- Jets (6)
- Kollisionen schwerer Ionen (5)
- heavy ion collisions (5)
- ALICE experiment (4)
- Collective Flow (4)
- Heavy Ions (4)
- Heavy Quark Production (4)
- Quark Gluon Plasma (4)
- Quark-Gluon Plasma (4)
- ALICE (3)
- Jets and Jet Substructure (3)
- QGP (3)
- pp collisions (3)
- Beauty production (2)
- Bone density (2)
- CT (2)
- Charm physics (2)
- Experimental nuclear physics (2)
- Experimental particle physics (2)
- Heavy-ion collisions (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Monte Carlo (2)
- Osteoporosis (2)
- Particle Correlations and Fluctuations (2)
- Particle and resonance production (2)
- Particle correlations and fluctuations (2)
- Pb–Pb collisions (2)
- QCD (2)
- Quark-Gluon-Plasma (2)
- Quarkonium (2)
- Relativistic heavy-ion collisions (2)
- Single electrons (2)
- Spine (2)
- Systematic Uncertainty (2)
- Time Projection Chamber (2)
- UrQMD Modell (2)
- quark-gluon-plasma (2)
- 900 GeV (1)
- ALICE LHC (1)
- ALICE detector (1)
- ALK (1)
- Analysis and statistical methods (1)
- Angiography (1)
- Anti-nuclei (1)
- Balance function (1)
- Bone diseases, Metabolic (1)
- Boosted Jets (1)
- CT dual-energy computed tomography (1)
- CVID (1)
- CaMPARI (1)
- Calorimeters (1)
- Centrality Class (1)
- Centrality Selection (1)
- Charge correlations (1)
- Charge fluctuations (1)
- Charged-particle density (1)
- Collective Flow, (1)
- Comparison with QCD (1)
- Computed tomography, X-ray (1)
- Contrast agent (1)
- Data processing methods (1)
- Diagnostic differentiation (1)
- Dielectron (1)
- Dielektron (1)
- Dual-energy computed tomography (1)
- Electron-pion identification (1)
- Electroweak interaction (1)
- Elliptic flow (1)
- Energie (1)
- European Society for Immunodeficiencies (ESID) (1)
- Femtoscopy (1)
- Fibre/foam sandwich radiator (1)
- Gadobutrol (1)
- Gadopentate dimeglumine (1)
- German PID-NET registry (1)
- HBT (1)
- Hadron production (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hard Scattering (1)
- Head and neck Cancer (1)
- Heavy Ion Experiment (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ions (1)
- Heavy-Ion Collision (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Heavy-ion detectors (1)
- Herniated disk (1)
- IgG substitution therapy (1)
- Image processing (1)
- In-Medium Zerfall (1)
- In-TIPS thrombosis (1)
- Inclusive spectra (1)
- Intensity interferometry (1)
- Intervertebral disc displacement (1)
- Invariant Mass Distribution (1)
- Ionisation energy loss (1)
- Jet Physics (1)
- Jet Substructure (1)
- Large Hadron Collider (1)
- Large detector systems for particle and astroparticle physics (1)
- Lymphadenopathy (1)
- MRI (1)
- MYCN amplification (1)
- Massenspektrum (1)
- Material budget (1)
- Meson (1)
- Mid-rapidity (1)
- Minimum Bias (1)
- Multi-Parton Interactions (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Neural network (1)
- Noninferiority (1)
- Nuclear modification factor (1)
- Osteoporotic fractures (1)
- PID prevalence (1)
- PYTHIA (1)
- Particle and Resonance Production (1)
- Pb–Pb (1)
- Percutaneous (1)
- Performance of High Energy Physics Detectors (1)
- Phantoms (imaging) (1)
- Production Cross Section (1)
- Properties of Hadrons (1)
- Proton–proton (1)
- Quantitative Imaging (1)
- Quark Deconfinement (1)
- Quark Production (1)
- Quark gluon plasma (1)
- RAS pathway (1)
- Rapidity Range (1)
- Relativistic heavy ion physics (1)
- Renal lesions (1)
- Resolution Parameter (1)
- Rho-Meson (1)
- SPS (1)
- Salivary gland diseases (1)
- Single muons (1)
- Structured reporting (1)
- TIPS (1)
- TR (1)
- Temperatur (1)
- Tomography (1)
- Tomography (x-ray computed) (1)
- Tracking (1)
- Transition radiation detector (1)
- Transjugular Intrahepatic Portosystemic Shunt (1)
- Transverse Momentum (1)
- Transverse momentum (1)
- Trigger (1)
- URQMD (1)
- Ultra-relativistic Quantum Molecular Dynamics model (1)
- Ultrarelativistic Quantum Molecular Dynamics (1)
- Ultrarelativistic Quantum Molecular Model (1)
- Ultrarelativistisches Quant Molekulares Modell (1)
- Ultrasonography (1)
- UrQMD (1)
- UrQMD model (1)
- Vector Boson Production (1)
- Verbreitung (1)
- Virtual noncalcium reconstructions (1)
- Wide rapidity coverage (1)
- X-ray computed (1)
- Xenon-based gas mixture (1)
- articular chondrocytes (1)
- biologicals (1)
- broadening (1)
- cardiac magnetic resonance (1)
- computer-assisted (1)
- cytosolic free calcium (1)
- dE/dx (1)
- detector (1)
- disease-modifying antirheumatic drugs (1)
- energy (1)
- experimental results (1)
- gravity (1)
- hadron hadron Kollision (1)
- hadron hadron collision (1)
- hadronic matter (1)
- hadronische Materie (1)
- heavy ion experiments (1)
- heavy ions (1)
- high throughput screening (1)
- high-risk neuroblastoma (1)
- immune-modulating therapy (1)
- in-medium decay (1)
- inflammatory arthritis (1)
- mass spectra (1)
- meson (1)
- myocardial fibrosis (1)
- p53 pathway (1)
- parabolic flight (1)
- primary immunodeficiency (PID) (1)
- quark gluon plasma (1)
- registry (1)
- registry for primary immunodeficiency (1)
- relativistic (1)
- relativistische (1)
- resectability (1)
- rho meson (1)
- scar (1)
- schwere Ione (1)
- spectra (1)
- spine (1)
- temperature (1)
- vertebroplasty (1)
- wound complications (1)
- √sN N = 2.76 TeV (1)
Institute
- Physik (1180)
- Frankfurt Institute for Advanced Studies (FIAS) (1060)
- Informatik (1024)
- Medizin (14)
- Hochschulrechenzentrum (3)
- Informatik und Mathematik (3)
- Geowissenschaften (2)
- Starker Start ins Studium: Qualitätspakt Lehre (2)
- Biowissenschaften (1)
- Buchmann Institut für Molekulare Lebenswissenschaften (BMLS) (1)
Understanding the role of parton mass and Casimir colour factors in the quantum chromodynamics parton shower represents an important step in characterising the emission properties of heavy quarks. Recent experimental advances in jet substructure techniques have provided the opportunity to isolate and characterise gluon emissions from heavy quarks. In this work, the first direct experimental constraint on the charm-quark splitting function is presented, obtained via the measurement of the groomed shared momentum fraction of the first splitting in charm jets, tagged by a reconstructed D0 meson. The measurement is made in proton-proton collisions at s√ = 13 TeV, in the low jet transverse-momentum interval of 15≤pjet chT<30 GeV/c where the emission properties are sensitive to parton mass effects. In addition, the opening angle of the first perturbative emission of the charm quark, as well as the number of perturbative emissions it undergoes, is reported. Comparisons to measurements of an inclusive-jet sample show a steeper splitting function for charm quarks compared with gluons and light quarks. Charm quarks also undergo fewer perturbative emissions in the parton shower, with a reduced probability of large-angle emissions.
Measurements of the sphericity of primary charged particles in minimum bias proton--proton collisions at s√=0.9, 2.76 and 7 TeV with the ALICE detector at the LHC are presented. The observable is linearized to be collinear safe and is measured in the plane perpendicular to the beam direction using primary charged tracks with pT≥0.5 GeV/c in |η|≤0.8. The mean sphericity as a function of the charged particle multiplicity at mid-rapidity (Nch) is reported for events with different pT scales ("soft" and "hard") defined by the transverse momentum of the leading particle. In addition, the mean charged particle transverse momentum versus multiplicity is presented for the different event classes, and the sphericity distributions in bins of multiplicity are presented. The data are compared with calculations of standard Monte Carlo event generators. The transverse sphericity is found to grow with multiplicity at all collision energies, with a steeper rise at low Nch, whereas the event generators show the opposite tendency. The combined study of the sphericity and the mean pT with multiplicity indicates that most of the tested event generators produce events with higher multiplicity by generating more back-to-back jets resulting in decreased sphericity (and isotropy). The PYTHIA6 generator with tune PERUGIA-2011 exhibits a noticeable improvement in describing the data, compared to the other tested generators.
n this paper measurements are presented of π+, π−, K+, K−, p and p¯¯¯ production at mid-rapidity < 0.5, in Pb-Pb collisions at sNN−−−√=2.76 TeV as a function of centrality. The measurement covers the transverse momentum (pT) range from 100, 200, 300 MeV/c up to 3, 3, 4.6 GeV/c, for π, K, and p respectively. The measured pT distributions and yields are compared to expectations based on hydrodynamic, thermal and recombination models. The spectral shapes of central collisions show a stronger radial flow than measured at lower energies, which can be described in hydrodynamic models. In peripheral collisions, the pT distributions are not well reproduced by hydrodynamic models. Ratios of integrated particle yields are found to be nearly independent of centrality. The yield of protons normalized to pions is a factor ~1.5 lower than the expectation from thermal models.
Correlations in azimuthal angle extending over a long range in pseudorapidity between particles, usually called the "ridge" phenomenon, were discovered in heavy-ion collisions, and later found in pp and p−Pb collisions. In large systems, they are thought to arise from the expansion (collective flow) of the produced particles. Extending these measurements over a wider range in pseudorapidity and final-state particle multiplicity is important to understand better the origin of these long-range correlations in small-collision systems. In this Letter, measurements of the long-range correlations in p−Pb collisions at sNN−−−√=5.02 TeV are extended to a pseudorapidity gap of Δη∼8 between particles using the ALICE, forward multiplicity detectors. After suppressing non-flow correlations, e.g., from jet and resonance decays, the ridge structure is observed to persist up to a very large gap of Δη∼8 for the first time in p−Pb collisions. This shows that the collective flow-like correlations extend over an extensive pseudorapidity range also in small-collision systems such as p−Pb collisions. The pseudorapidity dependence of the second-order anisotropic flow coefficient, v2(η), is extracted from the long-range correlations. The v2(η) results are presented for a wide pseudorapidity range of −3.1<η<4.8 in various centrality classes in p−Pb collisions. To gain a comprehensive understanding of the source of anisotropic flow in small-collision systems, the v2(η) measurements are compared to hydrodynamic and transport model calculations. The comparison suggests that the final-state interactions play a dominant role in developing the anisotropic flow in small-collision systems.
The ALICE Collaboration reports three measurements in ultra-peripheral proton−lead collisions at forward rapidity. The exclusive two-photon process \ggmm and the exclusive photoproduction of J/ψ are studied. J/ψ photoproduction with proton dissociation is measured for the first time at a hadron collider. The cross section for the two-photon process of dimuons in the invariant mass range from 1 to 2.5 GeV/c2 agrees with leading order quantum electrodynamics calculations. The exclusive and dissociative cross sections for J/ψ photoproductions are measured for photon−proton centre-of-mass energies from 27 to 57 GeV. They are in good agreement with HERA results.
The first measurement of the cross section for incoherent photonuclear production of J/ψ vector mesons as a function of the Mandelstam |t| variable is presented. The measurement was carried out with the ALICE detector at midrapidity, |y|<0.8, using ultra-peripheral collisions of Pb nuclei at a centre-of-mass energy per nucleon pair of sNN−−−√=5.02 TeV. This rapidity interval corresponds to a Bjorken-x range (0.3−1.4)×10−3. Cross sections are given in five |t| intervals in the range 0.04<|t|<1 GeV2 and compared to the predictions by different models. Models that ignore quantum fluctuations of the gluon density in the colliding hadron predict a |t|-dependence of the cross section much steeper than in data. The inclusion of such fluctuations in the same models provides a better description of the data.
The first measurement of the cross section for incoherent photonuclear production of 𝐽/𝜓 vector mesons as a function of the Mandelstam |𝑡| variable is presented. The measurement was carried out with the ALICE detector at midrapidity, |𝑦|<0.8, using ultraperipheral collisions of Pb nuclei at a center-of-mass energy per nucleon pair of √𝑠NN=5.02 TeV. This rapidity interval corresponds to a Bjorken-𝑥 range (0.3–1.4)×10−3. Cross sections are given in five |𝑡| intervals in the range 0.04<|𝑡|<1 GeV2 and compared to the predictions by different models. Models that ignore quantum fluctuations of the gluon density in the colliding hadron predict a |𝑡| dependence of the cross section much steeper than in data. The inclusion of such fluctuations in the same models provides a better description of the data.
Modification of charged-particle jets in event-shape engineered Pb–Pb collisions at √sNN = 5.02 TeV
(2024)
Charged-particle jet yields have been measured in semicentral Pb−Pb collisions at center-of-mass energy per nucleon-nucleon collision sNN−−−√=5.02 TeV with the ALICE detector at the LHC. These yields are reported as a function of the jet transverse momentum, and further classified by their angle with respect to the event plane and the event shape, characterized by ellipticity, in an effort to study the path-length dependence of jet quenching. Jets were reconstructed at midrapidity from charged-particle tracks using the anti-kT algorithm with resolution parameters R= 0.2 and 0.4, with event-plane angle and event-shape values determined using information from forward scintillating detectors. The results presented in this letter show that, in semicentral Pb−Pb collisions, there is no significant difference between jet yields in predominantly isotropic and elliptical events. However, out-of-plane jets are observed to be more suppressed than in-plane jets. Further, this relative suppression is greater for low transverse momentum (< 50 GeV/c) R= 0.2 jets produced in elliptical events, with out-of-plane to in-plane jet-yield ratios varying up to 5.2σ between different event-shape classes. These results agree with previous studies indicating that jets experience azimuthally anisotropic suppression when traversing the QGP medium, and can provide additional constraints on the path-length dependence of jet energy loss.
The ALICE Collaboration reports three measurements in ultra-peripheral proton−lead collisions at forward rapidity. The exclusive two-photon process \ggmm and the exclusive photoproduction of J/ψ are studied. J/ψ photoproduction with proton dissociation is measured for the first time at a hadron collider. The cross section for the two-photon process of dimuons in the invariant mass range from 1 to 2.5 GeV/c2 agrees with leading order quantum electrodynamics calculations. The exclusive and dissociative cross sections for J/ψ photoproductions are measured for photon−proton centre-of-mass energies from 27 to 57 GeV. They are in good agreement with HERA results.
The pseudorapidity dependence of elliptic (v2), triangular (v3), and quadrangular (v4) flow coefficients of charged particles measured in Pb-Pb collisions at a centre-of-mass energy per nucleon pair of sNN−−−√=5.02 TeV and in Xe-Xe collisions at sNN−−−√=5.44 TeV with ALICE at the LHC are presented. The measurements are performed in the pseudorapidity range −3.5<η<5 for various centrality intervals using two- and multi-particle cumulants with the subevent method. The flow probability density function (p.d.f.) is studied with the ratio of flow coefficient v2 calculated with four- and two-particle cumulant, and suggests that the variance of flow p.d.f. is independent of pseudorapidity. The decorrelation of the flow vector in the longitudinal direction is probed using two-particle correlations. The results measured with respect to different reference regions in pseudorapidity exhibit differences, argued to be a result of saturating decorrelation effect above a certain pseudorapidity separation, in contrast to previous publications which assign this observation to non-flow effects. The results are compared to 3+1 dimensional hydrodynamic and the AMPT transport model calculations. Neither of the models is able to simultaneously describe the pseudorapidity dependence of measurements of anisotropic flow and its fluctuations. The results presented in this work highlight shortcomings in our current understanding of initial conditions and subsequent system expansion in the longitudinal direction. Therefore, they provide input for its improvement.